#pragma mark 实现NSURLSessionDataDelegate代理

@interface ViewController ()<UITableViewDataSource,UITableViewDelegate,NSURLSessionDataDelegate>

{

    UIButton* sessionPostButton;

    UIButton* sessionDelegatePostButton;

    UITableView* table;

    NSMutableArray* array;

    NSMutableData* mutableData;

}

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    sessionPostButton=[[UIButton alloc]initWithFrame:CGRectMake(, , , )];

    sessionPostButton.backgroundColor=[UIColor orangeColor];

    [sessionPostButton setTitle:@"Session" forState:UIControlStateNormal];

    [sessionPostButton addTarget:self action:@selector(sessionPostData) forControlEvents:UIControlEventTouchUpInside];

    sessionDelegatePostButton=[[UIButton alloc]initWithFrame:CGRectMake(, , , )];

    sessionDelegatePostButton.backgroundColor=[UIColor orangeColor];

    [sessionDelegatePostButton setTitle:@"Delegate" forState:UIControlStateNormal];

    [sessionDelegatePostButton addTarget:self action:@selector(sessionDelegatePostData) forControlEvents:UIControlEventTouchUpInside];

    table=[[UITableView alloc]initWithFrame:CGRectMake(, , , -) style:UITableViewStylePlain];

    table.dataSource=self;

    table.delegate=self;

    [self.view addSubview:table];

    [self.view addSubview:sessionPostButton];

    [self.view addSubview:sessionDelegatePostButton];

}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section;

{

    return array.count;

}

#pragma mark 表示每一行显示什么数据

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;

{

    //内存优化

    static NSString * identity=@"cell";

    //tableview 根据标识复制出一个cell

    UITableViewCell * cell=[tableView dequeueReusableCellWithIdentifier:identity];

    if (cell==nil) {

        cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:identity];

    }

    NSDictionary* dic=array[indexPath.row];

    cell.textLabel.text=[dic valueForKey:@"title"];

    cell.detailTextLabel.text=[dic valueForKey:@"type"];

    cell.accessoryType=UITableViewCellAccessoryDisclosureIndicator;

    return  cell;

}

-(void)sessionPostData

{

    NSLog(@"sessionPost");

    //创建NSString用来存储请求的网址

    NSString* str=@"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx";

    //用UTF8String格式转换成NSURL

    NSURL* url=[NSURL URLWithString:[str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];

    //创建请求

    NSMutableURLRequest* request=[[NSMutableURLRequest alloc]initWithURL:url];

    [request setHTTPMethod:@"POST"];

    //设置参数

    NSString* where=@"date=20131129&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213";

    NSData* data=[where dataUsingEncoding:NSUTF8StringEncoding];

    [request setHTTPBody:data];

    //创建session对象 单例

    NSURLSession* session=[NSURLSession sharedSession];

    //发送请求

    NSURLSessionTask* task=[session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {

        if (data) {

            //处理数据

            NSDictionary* dic=[NSJSONSerialization JSONObjectWithData:data options: error:nil];

            array=[dic valueForKey:@"news"];

            [table reloadData];

        }

        if (error) {

            NSLog(@"%@",[error description]);

        }

    }];

    [task resume];

}

-(void)sessionDelegatePostData

{

    NSLog(@"sessionDelegatePost");

    //创建NSString用来存储请求的网址

    NSString* str=@"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx";

    //用UTF8String格式转换成NSURL

    NSURL* url=[NSURL URLWithString:[str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];

    //创建请求

    NSMutableURLRequest* request=[[NSMutableURLRequest alloc]initWithURL:url];

    [request setHTTPMethod:@"POST"];

    //设置参数

    NSString* where=@"date=20131129&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213";

    NSData* data=[where dataUsingEncoding:NSUTF8StringEncoding];

    [request setHTTPBody:data];

    //默认的session配置 从网络读取数据

    NSURLSessionConfiguration* config=[NSURLSessionConfiguration defaultSessionConfiguration];

    //遵守delegate

    NSURLSession* session=[NSURLSession sessionWithConfiguration:config delegate:self delegateQueue:nil];

    //发送请求

    NSURLSessionDataTask* task=[session dataTaskWithRequest:request];

    //初始化接收数据的容器

    mutableData=[NSMutableData data];

    //开始任务

    [task resume];

}

#pragma mark NSURLSessionDataDelegate中的方法

//#pragma mark 是否收到服务器响应 该方法不实现 实现后和后面方法冲突 用来测试服务器响应使用

//- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask

//didReceiveResponse:(NSURLResponse *)response

// completionHandler:(void (^)(NSURLSessionResponseDisposition disposition))completionHandler;

//{

//    NSLog(@"连接服务器成功");

//}

#pragma mark 服务器开始传输数据 反复调用本方法

- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask

    didReceiveData:(NSData *)data;

{

    NSLog(@"正在传输数据");

    [mutableData appendData:data];

}

#pragma mark 客户端接收数据完成时调用此方法

- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask

 willCacheResponse:(NSCachedURLResponse *)proposedResponse

 completionHandler:(void (^)(NSCachedURLResponse * __nullable cachedResponse))completionHandler;

{

    NSLog(@"数据传输完成");

    NSDictionary* dic=[NSJSONSerialization JSONObjectWithData:mutableData options:NSJSONReadingMutableContainers error:nil];

    array=[dic valueForKey:@"news"];

    [table reloadData];

}